EP3019835B1 - Improved magnetic core configuration for magnetic flowmeters - Google Patents
Improved magnetic core configuration for magnetic flowmeters Download PDFInfo
- Publication number
- EP3019835B1 EP3019835B1 EP14761507.4A EP14761507A EP3019835B1 EP 3019835 B1 EP3019835 B1 EP 3019835B1 EP 14761507 A EP14761507 A EP 14761507A EP 3019835 B1 EP3019835 B1 EP 3019835B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flowtube
- magnetic
- magnetic core
- stem
- spool
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 claims description 24
- 230000008569 process Effects 0.000 claims description 24
- 238000004804 winding Methods 0.000 claims description 18
- 239000012530 fluid Substances 0.000 claims description 16
- 239000007769 metal material Substances 0.000 claims 1
- 239000011162 core material Substances 0.000 description 27
- 230000004907 flux Effects 0.000 description 9
- 238000004891 communication Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000013024 troubleshooting Methods 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
- G01F1/586—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters constructions of coils, magnetic circuits, accessories therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
- G01F1/588—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters combined constructions of electrodes, coils or magnetic circuits, accessories therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
Definitions
- Magnetic flow meters are known and typically utilize an electrically insulated flowtube that carries a flow of process fluid past a coil of an electromagnet and past a pair of electrodes.
- the electromagnet applies an electromagnetic field to the flowing process fluid. Due to Faraday's Law of electromagnetic induction, a voltage or Electromotive Force (EMF) is generated between the pair of electrodes disposed in the process fluid. This voltage is a function of the strength of the applied magnetic field and is proportional to the fluid's rate of flow.
- EMF Electromotive Force
- WO 2013/010715 A1 , DE 10 2009 001413 A1 , DE 10 2007 004826 A1 show various examples of magnetic flow meters.
- a flowtube assembly for a magnetic flowmeter includes a flowtube configured to receive a flow of process fluid therethrough.
- a magnetic core is mounted on an outer surface of the flowtube and includes a stem extending transversely from the flowtube to a pair of arms. Each of the arms extends away from the stem laterally in opposite directions from each other along the flow tube axis.
- a spool having a plurality of magnetic windings is disposed about the stem and spaces the plurality of windings from the flowtube.
- FIG. 1 illustrates a typical environment 100 for magnetic flowmeter 102.
- Magnetic flowmeter 102 is coupled to process piping, illustrated diagrammatically at line 104, that also couples to control valve 112.
- Magnetic flowmeter 102 is configured to provide a flow rate output relative to process fluid flow in a process plant.
- process fluids include slurries and liquids in chemicals, pulp, pharmaceutical, food and other fluid processing plants.
- Magnetic flowmeter 102 includes electronics housing 120 connected to flowtube 108. Magnetic flowmeter 102 outputs are configured for transmission over long distances to a controller or indicator via process communication bus 106.
- communication bus 106 can be 4-20 mA current loop, a FOUNDATIONTM Fieldbus connection, a pulse output/frequency output, a Highway Addressable Remote Transducer (HART®) protocol communication, a wireless communication connection, such as that in accordance with IEC 62591, Ethernet, or a fiber optic connection to a controller such a system controller/monitor 110 or other suitable device.
- System controller 110 is programmed as a process monitor, to display flow information for a human operator or as a process controller to control the process using control valve 112 over process communication bus 106.
- Embodiments of the present invention are applicable to all magnetic flowmeters, they are particularly relevant to magnetic flowmeters with relatively small diameter process pipes. With such small flowtubes, it is sometimes difficult to fit the coil shields around the electrode isolation tunnels. Further, small flowtube-magnetic flowmeters may sometimes have elevated coil temperatures, and it is sometimes difficult to maximize magnetic flux passing through the process pipe.
- Embodiments of the present invention generally use a magnetic core piece that extends transversely from the flowtube and includes a pair of arms that extend laterally to the side sings. In one embodiment, the magnetic core is T-shaped.
- FIG. 2 is a diagrammatic view of a magnetic flowmeter having an improved magnetic core in accordance with the embodiment of the present invention.
- Flowmeter 150 includes T-shaped magnetic core 152 that extends from a substantially centered position 154 on flowtube 156 to each of side rings 158, 160. Additionally, a second T-shaped magnetic core 162 is mounted opposite core 152 on flowtube 156. In this way, current passing through coils 164, 166 generates a magnetic flux as indicated by magnetic flux lines 168.
- the magnetic flux indicated at reference numeral 168 is considered a primary magnetic flux in that it is the magnetic flux that induces a voltage or EMF across the conductive process fluid in relation to the flow rate of the process fluid.
- a pair of electrodes (not shown in FIG.
- T-shaped magnetic cores 152, 162 contact the process fluid and are used by the magnetic flowmeter circuitry to measure the induced voltage to determine the process fluid flow rate.
- the portions of T-shaped magnetic cores 152, 162 that generally extend substantially parallel to flowtube 156 are formed of a low reluctance core material that minimizes magnetic return path flux leakage.
- T-shaped magnetic cores 152, 162 may be formed of steel or magnetically soft materials which exhibit high magnetic permeability, but lower coercivity and hysteresis compared to most steels.
- each core may be formed of laminations of electrical steel similar to a transformer, in order to minimize the eddy currents and potentially allow the magnetic field to settle faster.
- cores 152, 162 show cores 152, 162 as having a T-shape, the important functionality is that a low reluctance path be provided from the winding assembly to the side rings of the flowmeter.
- other shapes such as a Y-shape could also be used in accordance with embodiments of the present invention.
- One feature of the improved magnetic core configuration is that the magnetic circuit is complete before a wrapper or other metallic housing is mounted over the assembly. In this way, testing and diagnostics of the device can be performed very easily.
- non-metallic winding spool 182 is formed of a moldable plastic.
- the plastics are preferably moldable and also have a high enough operating temperature that they can function properly in magnetic flowmeter 150.
- FIG. 3 is a diagrammatic cross sectional view of a portion of magnetic flowmeter 150 in accordance with an embodiment of the present invention.
- FIG. 3 only a portion of the flowtube 156 is shown.
- an electrically non-conducting interior liner 170 is provided adjacent metallic flowtube 156.
- Liner 170 ensures that the EMF induced in the process fluid does not reach metallic flowtube, which would short out induced EMF.
- liner 170 may be omitted.
- an electrode 172 passes through non-conductive liner 170 and contacts process fluid flowing through flowtube 156.
- a mounting member such as a threaded stud 174 is welded, or otherwise affixed, to flowtube 156.
- T-shaped core 152 includes stem portion 157 extending away from flowtube 156 and having a bore therein sized to receive mounting stud 174 for precisely positioning the core 162 relative to flowtube 156.
- T-shaped core 152 is clamped or otherwise secured in place by nut 176, which engages the threads of mounting stud 174.
- arms 153, 155 of core 152 are also welded, or otherwise secured, to respective rings 158, 160 at respective interfaces 178, 180.
- FIG. 3 illustrates spool 182 having an interior diameter 184 that is sized to pass outside diameter 186 of T-shaped core 152. Magnetic windings 164 are wound around spool 182 between guides 188 and 190.
- spool 182 can merely be slipped over outside diameter 186 of T-shaped core 152, which may then be mounted or placed upon mounting stud 174. The entire assembly is then fixed in place by tightening nut 176.
- T-shaped core 152 is welded to side rings 158, 160 at respective interfaces 178, 180.
- a cover or other suitable housing 192 can be placed over the assembly thereby completing the flowtube.
- Embodiments of the present invention are believed to increase the efficiency of flux generation through the flowtube. Specifically, embodiments of the present invention have allowed a reduction in the number of turns for the magnetic spools by 35% and 44% on two prototype flowtubes that have been produced in accordance with embodiments of the present invention while the signal strength has remained the same. Further still, embodiments of the present invention generally reduce the part count on the flowtube design. This is because the T-shaped core and coil spools each serve multiple purposes.
- the T-shaped core serves as the magnetic core, mounting bracket, and magnetic connection to side rings 158, 160.
- the coil spool serves as a winding form, electrical insulation, mounting bracket, standoff, and wire guide (which will be described in greater detail below with respect to FIG. 4 ).
- FIG. 4 is a diagrammatic view of a portion of flowtube 150 in accordance with an embodiment of the present invention.
- FIG. 4 illustrates T-shaped core 152 mounted to flowtube 156 with coil winding spool 182 mounted in place. Additionally, FIG. 4 illustrates one of the electrodes at reference numeral 194. Wires 196 and 198 make respective electrical connections to electrode 194 and coil winding 164. Given the strength of the magnetic field generated by the coil windings, if any of wires 196, 198 should move or otherwise change position, the output signal of the magnetic flowmeter will be affected. Thus, it is very important in the design of flowtube 150 that wires 196, 198 be held securely in place and not be allowed to shift.
- coil winding spool 182 includes a number of features that facilitate securely mounting wires 196, 198 in fixed positions within flowtube 150.
- electrode wire 196 passes by tab 200 which includes an aperture to which a cable tie or other suitable wire securing device can be snapped or otherwise affixed. This provides positive location of electrode wire 196 with respect to the magnetic field, which is very important to the operation of the magnetic flowmeter.
- wire 198 is bent at location 202 and passes through aperture 204 in guide 188 of spool 182.
- coil lead wire 198 is held in a precise location and strain relieved by passing through holes in the coil winding spools. This provides positive location and strain relief for the wires.
- One of the current challenges for known flowtube designs is that the combination of the heat generated by the magnetic coils and the heat escaping through the flowtube combine to increase the temperature of the coil. This forces a limit on the maximum process and ambient temperatures based on the thermal class rating of the magnetic wire, and/or the safety protection type (hazardous location rating) of the device.
- the maximum temperature of the coil can be reduced significantly. In one embodiment, dimension d is approximately 0.35 inches. This significantly reduces the maximum temperature of the coil in two ways. First, the temperature is reduced directly by providing thermal isolation from the flowtube wall.
- the temperature is also reduced indirectly since by reducing the temperature the coil is exposed to, the resistance of the winding decreases, thereby requiring less power to be dissipated in the field coils.
- Testing on prototypes built show a 40°C reduction in coil temperature as compared to known designs where coils are mounted directly on the flowtube. Separating the coils from the flowtube does not significantly reduce the magnetic field in the flowtube because the T-shaped core remains closely mounted to the flowtube.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measuring Volume Flow (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/038,296 US9097566B2 (en) | 2013-09-26 | 2013-09-26 | Magnetic core configuration for magnetic flowmeters |
PCT/US2014/052464 WO2015047617A1 (en) | 2013-09-26 | 2014-08-25 | Improved magnetic core configuration for magnetic flowmeters |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3019835A1 EP3019835A1 (en) | 2016-05-18 |
EP3019835B1 true EP3019835B1 (en) | 2020-01-08 |
Family
ID=51493081
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14761507.4A Active EP3019835B1 (en) | 2013-09-26 | 2014-08-25 | Improved magnetic core configuration for magnetic flowmeters |
Country Status (7)
Country | Link |
---|---|
US (1) | US9097566B2 (ja) |
EP (1) | EP3019835B1 (ja) |
JP (1) | JP6235157B2 (ja) |
CN (2) | CN203848882U (ja) |
CA (1) | CA2919858C (ja) |
RU (1) | RU2618753C1 (ja) |
WO (1) | WO2015047617A1 (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9097566B2 (en) * | 2013-09-26 | 2015-08-04 | Rosemount Inc. | Magnetic core configuration for magnetic flowmeters |
US9631962B2 (en) | 2014-03-18 | 2017-04-25 | Rosemount Inc. | Magnetic core configuration for magnetic flowmeters having a plurality of layers of magnetically permeable material |
US10371550B2 (en) * | 2016-10-24 | 2019-08-06 | Ademco Inc. | Compact magnetic field generator for magmeter |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4098118A (en) | 1977-02-23 | 1978-07-04 | Fischer & Porter Co. | Unitary electromagnetic flowmeter |
EP0047342B1 (de) | 1980-09-04 | 1984-01-11 | Rheometron Ag | Messwertaufnahmeeinrichtung für magnetisch-induktive Durchflussmessgeräte |
DE3511033A1 (de) * | 1985-03-27 | 1986-10-02 | Rheometron AG, Basel | Messwertaufnehmer fuer magnetisch-induktive durchflussmessgeraete |
JPS63145919A (ja) * | 1986-07-28 | 1988-06-18 | Toshiba Corp | 電磁流量計検出器 |
JP2557531B2 (ja) | 1989-09-12 | 1996-11-27 | 株式会社東芝 | 電磁流量計 |
ES2101404T3 (es) | 1993-10-14 | 1997-07-01 | Flowtec Ag | Detectores de flujo magnetico-inductivos. |
US6085599A (en) * | 1995-04-26 | 2000-07-11 | Feller; Murray F. | Magnetic flow sensor |
JP3662312B2 (ja) * | 1995-10-27 | 2005-06-22 | 株式会社山武 | 電磁流量計 |
US6463807B1 (en) * | 2000-11-02 | 2002-10-15 | Murray F. Feller | Magnetic flow sensor and method |
JP2004294176A (ja) * | 2003-03-26 | 2004-10-21 | Yokogawa Electric Corp | 電磁流量計 |
DE102006020265A1 (de) * | 2006-04-27 | 2007-10-31 | Endress + Hauser Flowtec Ag | Magnetisch-induktiver Meßaufnehmer |
DE102007004826B4 (de) | 2007-01-31 | 2009-06-18 | Ifm Electronic Gmbh | Messvorrichtung für ein magnetisch induktives Durchflussmessgerät und Durchflussmessgerät |
DE102008035740A1 (de) * | 2008-07-31 | 2010-02-04 | Abb Technology Ag | Magnetisch induktiver Durchflussmesser mit einer kombinierte magnetische Flussleitmittel umfassenden Elektromagenteinheit |
DE102009001413A1 (de) | 2009-03-09 | 2010-09-16 | Ifm Electronic Gmbh | Spulenanordnung für ein magnetisch induktives Durchflussmessgerät |
DE102011079351A1 (de) | 2011-07-18 | 2013-01-24 | Endress + Hauser Flowtec Ag | Magnetisch-induktives Durchflussmessgerät |
US9097566B2 (en) * | 2013-09-26 | 2015-08-04 | Rosemount Inc. | Magnetic core configuration for magnetic flowmeters |
-
2013
- 2013-09-26 US US14/038,296 patent/US9097566B2/en active Active
-
2014
- 2014-04-22 CN CN201420197472.6U patent/CN203848882U/zh not_active Expired - Fee Related
- 2014-04-22 CN CN201410162800.3A patent/CN104515556B/zh active Active
- 2014-08-25 JP JP2016545735A patent/JP6235157B2/ja active Active
- 2014-08-25 EP EP14761507.4A patent/EP3019835B1/en active Active
- 2014-08-25 RU RU2016110997A patent/RU2618753C1/ru not_active IP Right Cessation
- 2014-08-25 WO PCT/US2014/052464 patent/WO2015047617A1/en active Application Filing
- 2014-08-25 CA CA2919858A patent/CA2919858C/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
US20150082908A1 (en) | 2015-03-26 |
JP6235157B2 (ja) | 2017-11-22 |
CN203848882U (zh) | 2014-09-24 |
CN104515556B (zh) | 2018-09-21 |
RU2618753C1 (ru) | 2017-05-11 |
CA2919858A1 (en) | 2015-04-02 |
WO2015047617A1 (en) | 2015-04-02 |
EP3019835A1 (en) | 2016-05-18 |
JP2016532131A (ja) | 2016-10-13 |
CA2919858C (en) | 2018-06-05 |
US9097566B2 (en) | 2015-08-04 |
CN104515556A (zh) | 2015-04-15 |
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